jellyfin-server/MediaBrowser.Common.Implementations/ServerManager/WebSocketConnection.cs
2013-02-26 16:05:52 -05:00

226 lines
7.3 KiB
C#

using MediaBrowser.Common.Net;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Common.Implementations.ServerManager
{
/// <summary>
/// Class WebSocketConnection
/// </summary>
public class WebSocketConnection : IWebSocketConnection
{
/// <summary>
/// The _socket
/// </summary>
private readonly IWebSocket _socket;
/// <summary>
/// The _remote end point
/// </summary>
public string RemoteEndPoint { get; private set; }
/// <summary>
/// The _cancellation token source
/// </summary>
private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
/// <summary>
/// The _send semaphore
/// </summary>
private readonly SemaphoreSlim _sendSemaphore = new SemaphoreSlim(1,1);
/// <summary>
/// The logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// The _json serializer
/// </summary>
private readonly IJsonSerializer _jsonSerializer;
/// <summary>
/// Gets or sets the receive action.
/// </summary>
/// <value>The receive action.</value>
public Action<WebSocketMessageInfo> OnReceive { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="WebSocketConnection" /> class.
/// </summary>
/// <param name="socket">The socket.</param>
/// <param name="remoteEndPoint">The remote end point.</param>
/// <param name="jsonSerializer">The json serializer.</param>
/// <param name="logger">The logger.</param>
/// <exception cref="System.ArgumentNullException">socket</exception>
public WebSocketConnection(IWebSocket socket, string remoteEndPoint, IJsonSerializer jsonSerializer, ILogger logger)
{
if (socket == null)
{
throw new ArgumentNullException("socket");
}
if (string.IsNullOrEmpty(remoteEndPoint))
{
throw new ArgumentNullException("remoteEndPoint");
}
if (jsonSerializer == null)
{
throw new ArgumentNullException("jsonSerializer");
}
if (logger == null)
{
throw new ArgumentNullException("logger");
}
_jsonSerializer = jsonSerializer;
_socket = socket;
_socket.OnReceiveDelegate = OnReceiveInternal;
RemoteEndPoint = remoteEndPoint;
_logger = logger;
}
/// <summary>
/// Called when [receive].
/// </summary>
/// <param name="bytes">The bytes.</param>
private void OnReceiveInternal(byte[] bytes)
{
if (OnReceive == null)
{
return;
}
try
{
WebSocketMessageInfo info;
using (var memoryStream = new MemoryStream(bytes))
{
info = (WebSocketMessageInfo)_jsonSerializer.DeserializeFromStream(memoryStream, typeof(WebSocketMessageInfo));
}
info.Connection = this;
OnReceive(info);
}
catch (Exception ex)
{
_logger.ErrorException("Error processing web socket message", ex);
}
}
/// <summary>
/// Sends a message asynchronously.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="message">The message.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">message</exception>
public Task SendAsync<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
var bytes = _jsonSerializer.SerializeToBytes(message);
return SendAsync(bytes, cancellationToken);
}
/// <summary>
/// Sends a message asynchronously.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public Task SendAsync(byte[] buffer, CancellationToken cancellationToken)
{
return SendAsync(buffer, WebSocketMessageType.Text, cancellationToken);
}
/// <summary>
/// Sends a message asynchronously.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="type">The type.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">buffer</exception>
public async Task SendAsync(byte[] buffer, WebSocketMessageType type, CancellationToken cancellationToken)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
cancellationToken.ThrowIfCancellationRequested();
// Per msdn docs, attempting to send simultaneous messages will result in one failing.
// This should help us workaround that and ensure all messages get sent
await _sendSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
await _socket.SendAsync(buffer, type, true, cancellationToken);
}
catch (OperationCanceledException)
{
_logger.Info("WebSocket message to {0} was cancelled", RemoteEndPoint);
throw;
}
catch (Exception ex)
{
_logger.ErrorException("Error sending WebSocket message {0}", ex, RemoteEndPoint);
throw;
}
finally
{
_sendSemaphore.Release();
}
}
/// <summary>
/// Gets the state.
/// </summary>
/// <value>The state.</value>
public WebSocketState State
{
get { return _socket.State; }
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
_cancellationTokenSource.Dispose();
_socket.Dispose();
}
}
}
}